I'm not sure if a civilian design would fit in, but earlier, I was able to shoot a few pics of an old and dear friend, a Rockwell Aero Commander 500B.
In my years in aviation(over 35 years in general aviation), the one type I always enjoyed working was the Aero Commander, especially the turboprop version, especially that one, because I always knew when one was landing because it howled like a fierce raptor that's being forced to stay on the ground(angry howling).
And every time I saw one, my first thought was that it would not look out of place with a planing hull and wingtip floats. Yes, to me, it was a secret flying boat forced to stay on land.
And will be a he'll of a little.